Alvania calasi is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.[1]
Fossils of this species were in the Lower Pliocene strata in the Loire-Atlantique, France.
Van Dingenen F., Ceulemans L. & Landau B.M. (2016). The lower Pliocene gastropods of Le Pigeon Blanc (Loire-Atlantique, north west France), 2. Caenogastropoda. Cainozoic Research. 16(2): 109-219
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